One of the technical parameters of the pressure transmitter is the measurement accuracy, that is, the measurement error, which is generally: 0.075%, 0.1%, 0.2%, 0.5% Etc. When calculating the total error of one pressure sensor, the error defined below should be considered.
Some nominal specifications can be reduced or eliminated in specific user applications, for example, if a pressure sensor is used in half of the specified temperature range If the automatic zero adjustment technology is used, the zero offset and drift error can be eliminated.
The zero offset is the sensor output when the same pressure is applied to both sides of the diaphragm at the same time. The range is the algebraic difference between the output endpoints. The end of the scale is usually zero and full.
The zero temperature offset is caused by the temperature change of the pressure sensor zero point change.
Zero offset is not a predictable error because every device can The temperature change will cause the whole output curve to shift up or down along the voltage axis.
Sensitivity temperature offset is the sensitivity change of pressure sensor caused by temperature change, which will cause the slope change of sensor output curve.
The linear error is the deviation between the sensor output curve and a calibration line in the expected pressure range, It provides the matching line of data points mathematically. The error sources of each pressure transmitter can be summarized as follows: some are system errors, and some are system errors Some are random errors. For some errors that can be eliminated, we should find ways to eliminate them through technical improvement to ensure that the transmitter has good output. For measurement The corresponding measurement error accuracy can be selected according to the requirements of working conditions, so that the measurement accuracy will not be too large to affect the measurement results.